Laptop won't start up

I removed the 256 memory that was installed as standard in the HP ze4400 pavilion laptop to see how I could increase it to make it faster.But when I put it back in it wouldn't start up. Is there something I should or should not have done when reinstalling it.

I get the normal Windows screen at start up with the green squares moving across and then just a black blank screen.

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Hello
Memory Upgrade for IBM ThinkPad R32 2658-xxx Laptop, the IBM ThinkPad R32 2658-xxx Laptop takes the PC2100 DDR SDRAM SODIMMs Memory Type, and comes installed with 128 or 256 MB (removable) of Memory. You can upgrade your IBM ThinkPad R32 2658-xxx Laptop to up to a maximum of 1.0 GB Memory, the system has 2 sockets to install Memory, already with 128 or 256 MB (removable) standard Memory installed. For best Laptop performance use the maximum amount of allowed Memory per slot for your Laptop.
good luck and do rate the solution if helps.

Compaq Presario V V3000 SpecificationMemory Type: DDR2 SODIMM 200pinDDR SODIMM:DDR, double data rate is a type of SDRAM in which data is sent on both the rising and falling edges of clock cycles in a data burst. It is usually referred to as DDR as opposed to DDR SDRAM.SODIMM, small outline dual inline memory module. Smaller and thinner than standard DIMMs, SODIMMs are typically used in laptop computers.Memory Speed:PC2-4200, PC2-5300Chipset: Intel 945GMChipset :A group of chips that together make up a complete computer processing unit, usually on one circuit board (the motherboard). It may include the main central processor, graphics processors, secondary cache memory, and input-output controllers. Memory is one component controlled by the chipset.
Standard Memory:512MBRemovableMemory Slot(s): 2Max. Memory Per System:2048MB (2GB)Max. Memory Per Slot: 2048MB (2GB)Dual Channel Memory Support: SupportedDual Channel :A development in motherboard and chipset design that allows for increased bandwidth transfer when using two or more memory modules in separate transfer channels. These separate channels allow each module access to the memory controller, increasing throughput bandwidth. It is a good idea to use matched pairs of modules to ensure the best compatibility for dual channel operation.
Tri-Channel Memory Support: Not SupportTri-Channel :A development in motherboard and chipset design that allows for increased bandwidth transfer when using three or more memory modules in separate transfer channels. These separate channels allow each module access to the memory controller, increasing throughput bandwidth. It is a good idea to use matched three modules to ensure the best compatibility for tri-channel operation.
Install Memory in Pairs:Not RequiredInstall in Pairs :Memory modules must be installed in pairs of matched memory size. This means that if you purchased your computer with 128 MB of memory installed and you want to add another 512 MB of memory, you must remove the two continuity modules and replace them with two 256-MB memory modules.

The motherboard will only recognize 256 module. If you go to crucial.com and run the memory test, it will tell you the maximum memory the motherboard will support. So buyin a higher memory stick is wasting your money since it will not support it.